1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*
* fdtdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com>
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <libfdt.h>
#include <libfdt_env.h>
#include <fdt.h>
#include "util.h"
#define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1))
#define PALIGN(p, a) ((void *)(ALIGN((unsigned long)(p), (a))))
#define GET_CELL(p) (p += 4, *((const uint32_t *)(p-4)))
static const char *tagname(uint32_t tag)
{
static const char * const names[] = {
#define TN(t) [t] #t
TN(FDT_BEGIN_NODE),
TN(FDT_END_NODE),
TN(FDT_PROP),
TN(FDT_NOP),
TN(FDT_END),
#undef TN
};
if (tag < ARRAY_SIZE(names))
if (names[tag])
return names[tag];
return "FDT_???";
}
#define dumpf(fmt, args...) \
do { if (debug) printf("// " fmt, ## args); } while (0)
static void dump_blob(void *blob, bool debug)
{
uintptr_t blob_off = (uintptr_t)blob;
struct fdt_header *bph = blob;
uint32_t off_mem_rsvmap = fdt32_to_cpu(bph->off_mem_rsvmap);
uint32_t off_dt = fdt32_to_cpu(bph->off_dt_struct);
uint32_t off_str = fdt32_to_cpu(bph->off_dt_strings);
struct fdt_reserve_entry *p_rsvmap =
(struct fdt_reserve_entry *)((char *)blob + off_mem_rsvmap);
const char *p_struct = (const char *)blob + off_dt;
const char *p_strings = (const char *)blob + off_str;
uint32_t version = fdt32_to_cpu(bph->version);
uint32_t totalsize = fdt32_to_cpu(bph->totalsize);
uint32_t tag;
const char *p, *s, *t;
int depth, sz, shift;
int i;
uint64_t addr, size;
depth = 0;
shift = 4;
printf("/dts-v1/;\n");
printf("// magic:\t\t0x%x\n", fdt32_to_cpu(bph->magic));
printf("// totalsize:\t\t0x%x (%d)\n", totalsize, totalsize);
printf("// off_dt_struct:\t0x%x\n", off_dt);
printf("// off_dt_strings:\t0x%x\n", off_str);
printf("// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
printf("// version:\t\t%d\n", version);
printf("// last_comp_version:\t%d\n",
fdt32_to_cpu(bph->last_comp_version));
if (version >= 2)
printf("// boot_cpuid_phys:\t0x%x\n",
fdt32_to_cpu(bph->boot_cpuid_phys));
if (version >= 3)
printf("// size_dt_strings:\t0x%x\n",
fdt32_to_cpu(bph->size_dt_strings));
if (version >= 17)
printf("// size_dt_struct:\t0x%x\n",
fdt32_to_cpu(bph->size_dt_struct));
printf("\n");
for (i = 0; ; i++) {
addr = fdt64_to_cpu(p_rsvmap[i].address);
size = fdt64_to_cpu(p_rsvmap[i].size);
if (addr == 0 && size == 0)
break;
printf("/memreserve/ %llx %llx;\n",
(unsigned long long)addr, (unsigned long long)size);
}
p = p_struct;
while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
dumpf("%04zx: tag: 0x%08x (%s)\n",
(uintptr_t)p - blob_off - 4, tag, tagname(tag));
if (tag == FDT_BEGIN_NODE) {
s = p;
p = PALIGN(p + strlen(s) + 1, 4);
if (*s == '\0')
s = "/";
printf("%*s%s {\n", depth * shift, "", s);
depth++;
continue;
}
if (tag == FDT_END_NODE) {
depth--;
printf("%*s};\n", depth * shift, "");
continue;
}
if (tag == FDT_NOP) {
printf("%*s// [NOP]\n", depth * shift, "");
continue;
}
if (tag != FDT_PROP) {
fprintf(stderr, "%*s ** Unknown tag 0x%08x\n", depth * shift, "", tag);
break;
}
sz = fdt32_to_cpu(GET_CELL(p));
s = p_strings + fdt32_to_cpu(GET_CELL(p));
if (version < 16 && sz >= 8)
p = PALIGN(p, 8);
t = p;
p = PALIGN(p + sz, 4);
dumpf("%04zx: string: %s\n", (uintptr_t)s - blob_off, s);
dumpf("%04zx: value\n", (uintptr_t)t - blob_off);
printf("%*s%s", depth * shift, "", s);
utilfdt_print_data(t, sz);
printf(";\n");
}
}
/* Usage related data. */
static const char usage_synopsis[] = "fdtdump [options] <file>";
static const char usage_short_opts[] = "ds" USAGE_COMMON_SHORT_OPTS;
static struct option const usage_long_opts[] = {
{"debug", no_argument, NULL, 'd'},
{"scan", no_argument, NULL, 's'},
USAGE_COMMON_LONG_OPTS
};
static const char * const usage_opts_help[] = {
"Dump debug information while decoding the file",
"Scan for an embedded fdt in file",
USAGE_COMMON_OPTS_HELP
};
int main(int argc, char *argv[])
{
int opt;
const char *file;
char *buf;
bool debug = false;
bool scan = false;
off_t len;
while ((opt = util_getopt_long()) != EOF) {
switch (opt) {
case_USAGE_COMMON_FLAGS
case 'd':
debug = true;
break;
case 's':
scan = true;
break;
}
}
if (optind != argc - 1)
usage("missing input filename");
file = argv[optind];
buf = utilfdt_read_len(file, &len);
if (!buf)
die("could not read: %s\n", file);
/* try and locate an embedded fdt in a bigger blob */
if (scan) {
unsigned char smagic[4];
char *p = buf;
char *endp = buf + len;
fdt_set_magic(smagic, FDT_MAGIC);
/* poor man's memmem */
while (true) {
p = memchr(p, smagic[0], endp - p - 4);
if (!p)
break;
if (fdt_magic(p) == FDT_MAGIC) {
/* try and validate the main struct */
off_t this_len = endp - p;
fdt32_t max_version = 17;
if (fdt_version(p) <= max_version &&
fdt_last_comp_version(p) < max_version &&
fdt_totalsize(p) < this_len &&
fdt_off_dt_struct(p) < this_len &&
fdt_off_dt_strings(p) < this_len)
break;
if (debug)
printf("%s: skipping fdt magic at offset %#zx\n",
file, p - buf);
}
++p;
}
if (!p)
die("%s: could not locate fdt magic\n", file);
printf("%s: found fdt at offset %#zx\n", file, p - buf);
buf = p;
}
dump_blob(buf, debug);
return 0;
}
|
